Mazda 6 2002, Workshop Manual

Page: 334 / 1248

F–204
TROUBLESHOOTING
NO.11 ENGINE STALLS/QUITS, ENGINE RUNS ROUGH, MISSES, BUCK/JERK, HESITATION/STUMBLE,
SURGES
A6E398018881W13
11
ENGINE STALLS/QUITS — ACCELERATION/CRUISE
ENGINE RUNS ROUGH — ACCELERATION/CRUISE
MISSES — ACCELERATION/CRUISE
BUCK/JERK — ACCELERATION/CRUISE/DECELERATION
HESITATION/STUMBLE — ACCELERATION
SURGES — ACCELERATION/CRUISE
DESCRIPTION
•
Engine stops unexpectedly at beginning of acceleration or during acceleration.
•
Engine stops unexpectedly while cruising.
•
Engine speed fluctuates during acceleration or cruising.
•
Engine misses during acceleration or cruising.
•
Vehicle bucks/jerks during acceleration, cruising, or deceleration.
•
Momentary pause at beginning of acceleration or during acceleration
•
Momentary minor irregularity in engine output
POSSIBLE CAUSE
•
A/C system operation is improper.
•
Erratic signal or no signal from CMP sensor
•
Air leakage from intake-air system parts
•
Purge solenoid valve malfunction
•
IAC valve improper operation
•
EGR valve malfunction
•
Erratic signal from CKP sensor
•
Low engine compression
•
Vacuum leakage
•
Poor fuel quality
•
Main relay intermittent malfunction
•
Throttle body malfunction
•
Engine overheating
•
Spark plug malfunction
•
Improper air/fuel mixture ratio control operation
•
Improper VTCS operation
•
Spark leakage from high-tension leads
•
Air cleaner restriction
•
PCV valve malfunction
•
Improper valve timing due to jumping out timing belt
•
Restriction in exhaust system
•
Intermittent open or short in fuel body pump circuit
•
Inadequate fuel pressure
•
Fuel pump mechanical malfunction
•
Fuel leakage from fuel injector
•
Fuel injector clogging
•
Fuel line restriction or clogging
•
Pressure regulator malfunction
•
TP sensor misadjustment
•
Intermittent open or short of MAF sensor, TP sensor and VSS
•
ATX malfunction (ATX)
•
Clutch slippage (MTX)
•
Improper VTCS operation
Warning
The following troubleshooting flow chart contains the fuel system diagnosis and repair
procedures. Read the following warnings before performing the fuel system services:
•
Fuel vapor is hazardous. It can easily ignite, causing serious injury and damage. Always
keep sparks and flames away from fuel.
•
Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injuries or
death and damage. Fuel can also irritate skin and eyes. To prevent this, always complete
"BEFORE REPAIR PROCEDURE" and "AFTER REPAIR PROCEDURE" described in this
manual.
(See
F–17 BEFORE REPAIR PROCEDURE .)
(See F–17 AFTER REPAIR PROCEDURE .)
Caution
•
Disconnecting/connecting quick release connector without cleaning it may possibly cause
damage to fuel pipe and quick release connector. Always clean quick release connector
joint area before disconnecting/connecting, and make sure that it is free of foreign material.